We did something similar for our wedding, except that I skipped SMS and used Google forms and sheets for all the organisation. I don't think we actually had the mobile numbers of all our guests... even some of the email addresses had to be pre-procured. My wife and I could keep track of things just by going to our Google drives, and I didn't feel the need to write any scripts. In your opinion, what was the main advantage of using SMS? Was it the part about keeping up to date on rsvp stats?